I have seen several posts stating that the preferred viscosity for oil is 5w30 and others say 10w30. Since ownership I have only used synthetic but wondered whether to stick to 5 or use 10?

What is the difference?

What is the preference for daily driving?

What brand is best? ( I used Mobil1 on my last change but I can tell it will be quite expensive over time. This stuff isn't cheap!)

It's an 07 Revup motor with 71,000 grand on the odometer. I live in NJ and deal with seasonal weather. When summer its pretty hot and when its winter its pretty darn cold. So the car will deal with all types of temperatures from one extreme to the next.

Thanks...

 

5W30 will save you a wee bit of gas. 10W30 offers a wee bit more protection in warmer climates. Really, either will be fine.

 

TXScout is right... no surprise there.

There have been loooooooooooooooooooong threads on this topic here and on almost every car forum on the net. For the VQ engine, the wear numbers suggest that Mobil 1 is not the best. Look at Castrol Edge or Pennziol Platinum... and hit the search button for finding one of those loooooooooooong threads. While you're at it, invest in good filters such as K&N, Pure 1, Mobil 1, Bosch, Wix or some other good ones. Avoid Fram!

You can go 5/30 in winter and 10/30 in the summer, and change your oil every 7-8K miles as opposed to every 3-4K.

Good luck,
Isa

 

German Castrol 0W-30 or Penzoil Ultra 5W-30 for me.

 

Thanks. Last thing I want to do is start a long thread that already has been discussed before. Just wanted some quick direction and the best recommendation for my G35....

 

Some here will whine about Mobil 1 wearing harder on the VQ. But I find it funny that most high end European, German, and Japanese car manufacturers use it, my Nissan Dealership uses it in the Quick change area. Seems to me that it would not be in Nissans interest to use an oil that would give you trouble down the road.

 

I haven't used Royal Purple myself in a while because I couldn't tell any difference, BUT I was at a major petrochemical refinery for a while lately, and I saw pallets of barrels of Royal Purple lying around for their use. Being the Royal Purple is not owned by said oil company who shall remain nameless (starts with a "C"), I'd assume there's something to it since they didn't even use their own oil.

 

It's used widely in reciprocating machinery (gas compressors, pumps, gear reduction systems etc), search the web a bit. It has been shown to reduce the amount of horsepower needed and lengthens time between rebuilds. It's good stuff.

Remember, it's being used in engines the size of a bus, running at less than 600rpm (yes, 600, not 6000rpm)

 

was not aware of that, good info.

 

There is so much false info here, to start, what big tex stated was completely wrong... Everyone who reads this forum just leave it and forget it all. Go to motor oil college. let me know when you pass the motor oil final exam.

bobistheoilguy.com

 

I know what I see. You will find RP on MOST compressors off/onshore. It has PROVEN to make engines last longer and reduce internal friction so less horsepower is required for a given compression level.

The stuff goes out there by the 55 gallon drum.

http://www.machinerylubrication.com/...icant-upgrades

http://www.wennigercompressor.com/Synerlec.htm

http://www.mt-online.com/marchapril2...vironments/pdf

 

I am referring to this:
"5W30 will save you a wee bit of gas. 10W30 offers a wee bit more protection in warmer climates. Really, either will be fine."

please, explain why this is true^...because it's a completely idiotic statement.

Talking about royal purple being used in a different machine is completely irrelevant to our engine longevity and performance. If you want to go buy a 55 gallon drum of oil and use it for life you are an idiot. It will break down over time and become useless. So read that link I put up Tex. Come back to admit you were wrong, if you can make it through the ten chapters.

OP... M1 is cheap. If you drive fast, you have to change your oil every 4k minimal.
If you never use the gas, 5k tops. With the newest most advanced oil out there today you will still need to change it at 5k.

Best oils for our car in my opinion (influenced by bob)

Spirited daily driving: AMS oil 5w-20 or Redline (Yes, OEM is 5w-30)

Daily driving: Mobile1 0w20 Change at LEAST every 5k. It will burn off most likely so check the stick periodically after the engine has been sitting all night.

 

If you don't understand why, I'm not wasting time explaining it to you.

 

I like to learn, teach me something.

 

You are convinced that viscosity has nothing to do with engine drag or protection so what's the point.